django PermissionRequiredMixin permission_required 不起作用

Question

视图.py

class templateList(PermissionRequiredMixin, TemplateView):
    permission_required = 'accounts.template_all'

    def get(self, request, *args, **kwargs):
        #view logic
        print(self.request.user.has_perms('accounts.template_all'))
        return render(request, template_name, context)

帐户/模型.py

class User(AbstractBaseUser, PermissionsMixin):
    # some fields here
    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')

        permissions = (
            ("template_all", "access to all templates"),
        )

视图名称.___mro____

(<class 'template.views.templateList'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'object'>)

self.request.user.has_perms('accounts.template_all')在 views.py 中返回正确的布尔值，但是self.has_permission()每次都返回 True。permission_required没有效果，即使打印返回 false，用户仍然可以看到页面。self.get_permission_requiredalos 返回正确的值。帮助表示赞赏。

Answer 1

总之：在PermissionRequiredMixin基类应该放在之前的TemplateView基类，使得MRO（方法解析顺序）是正确的，并调度点的倍率PermissionRequiredMixin。

APermissionRequiredMixin修补dispatch(..)方法（它添加了一个额外的检查，以查看用户是否具有适当的权限）。然而，在这里您已按顺序放置子类，从而导致dispatch(..)函数是View类中的函数。

事实上，如果我们看看 MRO，我们会看到：

>>> ViewName.__mro__
(<class 'ViewName'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'object'>)

如果我们查看调用时调用的方法.dispatch(..)，我们会看到：

>>> ViewName.dispatch
<function View.dispatch at 0x7f169e8f6620>

为了让mixin覆盖原来的.dispatch(..)函数，我们需要先把它放在基类中，比如：

# PermissionRequiredMixin is put before TemplateView

class ViewName(PermissionRequiredMixin, TemplateView):
    permission_required = 'accounts.action_all'
    # ...

然后我们看到：

>>> ViewName.__mro__
(<class 'ViewName'>, <class 'django.contrib.auth.mixins.PermissionRequiredMixin'>, <class 'django.contrib.auth.mixins.AccessMixin'>, <class 'django.views.generic.base.TemplateView'>, <class 'django.views.generic.base.TemplateResponseMixin'>, <class 'django.views.generic.base.ContextMixin'>, <class 'django.views.generic.base.View'>, <class 'object'>)
>>> ViewName.dispatch
<function PermissionRequiredMixin.dispatch at 0x7f168b41d620>